Question

How can we find the smallest 5 digit number which is exactly divisible be 12,18,15,20

Answer 1

LCM OF 12,15,18,20=180
ADD TWO MORE ZEROS TO MAKE IT 5 DIGIT=18000

Answer 2

first find the L.C.M of 12,15,18,20.
that is
180.
smallest 5 dgt no. =10000.  10000 divided by 180
gives remainder = 100
Now subtract 100 from 180 =80
and add in given no.
that is answer